Ultrasonic nebulizer



FIG. 1 is a front perspective view of an ultrasonic nebulizer showing my new design;

FIG. 2 is a rear elevation thereof;

FIG. 3 is a side elevation thereof, the opposite being a mirror image; and

FIG. 4 is a bottom plan view thereof. 

The ornamental design for an ultrasonic nebulizer, as shown. 